dtfits - display FITS table
dumps the contents of a FITS table in an ASCII format, either into
a user-specified file or on stdout. The output is formatted on a fixed number
of columns to make it readable by human beings. Additional informations are
printed out before the table values are dumped, these informations can be
skipped by using the -d option.
Last, if you want to dump the table into an easily parsable format (for a piece
of software), you might want to use the -s option which specifies a character
to use as separator. All data fields will be printed out separated by this
character only. This allows to use string parsers to cut down the output lines
into tokens by looking for this separator. Fields (lines) will still be
delimited by the end-of-line character. This option produces ASCII tables
which are easy to parse for a piece of software but mostly unreadable to human
Notice that dtfits
only accepts one single FITS table in input.
- Skip information output about the table and column names.
Outputs only the table values. Beware that if the FITS file contains
several extensions, they will all appear one after another, separated only
by two blank lines. In that case, it would be preferrable to keep the
complete output and parse out the returned stream to differentiate which
data come from where.
- -s <char>
- Use the character <char> as separator in output. This
option is useful if you want to produce a table that should be parsed by a
piece of software (see above description). The separator can only be a
single non-null character. To avoid special characters being interpreted
by the shell, it is recommended to provide this character always between
simple or double quotes. Example:
dtfits -s '&' table.tfits
If you want to use a special character as separator, such as a tab, use ^V to
insert your character, such as:
dtfits -s '^V<TAB>' table.tfits
which means: you type CTRL-V and then the tab key.
FITS tables are stored into extensions. If there are several tables in a file,
they will all be displayed one after another in the same output stream.